How to find correct value of (a%M/b)? where M is modulo operator.

I want to find a/b . but since a is very large i am taking modulo of it. and now when i divide it by b then it gives wrong answer. So I want a/b from a%m/b. Please tell me how to I get that.

here a is (xyz*something)%M

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Related to ongoing Contest!

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Oh really? Which problem?

FLOORING i think

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